extends TestStringSortedMapGenerator {
    @Override
    public SortedMap<String, String> create(Entry<String, String>[] entries) {
      return ImmutableSortedMap.copyOf(asList(entries));
    }
  }

  public static class ImmutableSortedMapEntryListGenerator
      implements TestListGenerator<Entry<String, Integer>> {

    @Override

              @Override
              public Set<AnEnum> create(AnEnum[] elements) {
                return (elements.length == 0)
                    ? EnumSet.noneOf(AnEnum.class)
                    : EnumSet.copyOf(MinimalCollection.of(elements));
              }
            })
        .named("EnumSet")
        .withFeatures(
            SetFeature.GENERAL_PURPOSE,
            CollectionFeature.SERIALIZABLE,

        K castKey = (K) key;
        V value = getIfPresent(key);
        if (value != null) {
          result.put(castKey, value);
        }
      }
    }
    return ImmutableMap.copyOf(result);
  }

  /** @since 11.0 */
  @Override
  public void put(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /** @since 12.0 */
  @Override

    ImmutableList.Builder<List<E>> axesBuilder = new ImmutableList.Builder<>(lists.size());
    for (List<? extends E> list : lists) {
      List<E> copy = ImmutableList.copyOf(list);
      if (copy.isEmpty()) {
        return ImmutableList.of();
      }
      axesBuilder.add(copy);
    }
    return new CartesianList<>(axesBuilder.build());
  }

                  @Override
                  protected Set<String> create(String[] elements) {
                    Table<String, Integer, Character> table =
                        ArrayTable.create(ImmutableList.copyOf(elements), ImmutableList.of(1, 2));
                    populateForRowKeySet(table, elements);
                    return table.rowKeySet();
                  }
                })

   * the current capacity.
   */
  void resizeEntries(int newCapacity) {
    this.entries = Arrays.copyOf(requireEntries(), newCapacity);
    this.elements = Arrays.copyOf(requireElements(), newCapacity);
  }

  @CanIgnoreReturnValue
  private int resizeTable(int oldMask, int newCapacity, int targetHash, int targetEntryIndex) {

                  @Override
                  protected Set<String> create(String[] elements) {
                    Table<String, Integer, Character> table =
                        ArrayTable.create(ImmutableList.copyOf(elements), ImmutableList.of(1, 2));
                    populateForRowKeySet(table, elements);
                    return table.rowKeySet();
                  }
                })

  public static <V extends @Nullable Object> ListenableFuture<List<V>> allAsList(
      ListenableFuture<? extends V>... futures) {
    ListenableFuture<List<@Nullable V>> nullable =
        new ListFuture<V>(ImmutableList.copyOf(futures), true);
    // allAsList ensures that it fills the output list with V instances.
    @SuppressWarnings("nullness")
    ListenableFuture<List<V>> nonNull = nullable;
    return nonNull;
  }

  /**

                new TestStringListGenerator() {

                  @Override
                  protected List<String> create(String[] elements) {
                    return new StandardImplForwardingList<>(ImmutableList.copyOf(elements));
                  }
                })
            .named("ForwardingList[ImmutableList] with standard implementations")
            .withFeatures(CollectionSize.ANY, CollectionFeature.ALLOWS_NULL_QUERIES)

                new TestStringListGenerator() {

                  @Override
                  protected List<String> create(String[] elements) {
                    return new StandardImplForwardingList<>(ImmutableList.copyOf(elements));
                  }
                })
            .named("ForwardingList[ImmutableList] with standard implementations")
            .withFeatures(CollectionSize.ANY, CollectionFeature.ALLOWS_NULL_QUERIES)